class_docstr: Class that can be used for gathering statistics 
  about data by easily storing lists of different data
code: def _get_lst(self):
      lkey = self.LKEY
      if lkey not in self:
          self[lkey] = []
      return self[lkey]
  
imports: import glob
  import numpy
  import os
  import re
  import tempfile
  from addict import Dict
  from collections import defaultdict
  from pathlib import Path
  from subprocess import call
  import cv2
  from ..dataset import GluonCVMotionDataset, DataSample, FieldNames, get_resized_video_location
  from ..io.video_io import VideoFrameReader, VideoSortedFolderReader, cmd_with_addn_args, FFMPEG_FOURCC
label_desc: Use image node_id 1 for calling the AddictList obj's underlying member method code with example usage: obj._get_lst() and returns: self